Assiotob



C. E. SCHOSSLER.

STOOL.

APPLICATION FILED SEPT|I8,1914.

Patented Aug. 15, 1916.

@ARL EMIL SCHOSSIER, F TOLEDO, OHIO, ASSIGNOR TO THE RANSOM @t JRNIIDOLPH COMPANY, OF TOLEDO, OHIO,- A. CORPORATION 0F OHIO.

To all whom t mafylconcem:

Be it known that li, CARL-EMIL l a subject of the King of Denmark, residing at rloledo, in the -county of Lucas and State of Ohio, have invented a certain new and useful Improvement in Stools, of which the following is a, full, clear, concise, and

eXact description, reference being had tov the accompanying drawings, forming a part of this specification. My invention relates to stools, particularly dental stools, and its object is to produce a highly improved article of this class.

As is well known to persons familiar with articles of the class to which my invention relates, a dental stool should be so constructed that the vertical position of the seat may be readily adjusted by the dentist while he is at work, and, moreover, the seat-carrying.- post or standard should be so mounted that the same may be inclined-in 'any'direction within certain limits.

My invention -isparticularly concerned with the provision of mechanism whereby the seat may be readily adjusted as desired, and whereby the seat-post may be inclined from the vertical in any direction.

y horizontal sectional view taken on the line 4-4 of Fig. 2, looking in the direction indicated by the arrows.

Similar reference numerals refer to similar 'parts throughout the several views.

As is clearly shown in the drawings, the stool of my invention comprises a lhollow base 5 having a depression or socket 6 formed inthe top thereof. Disposed in the socket 6 and arranged to turn therein is a balll 7, this ball being retained in position by a collar 8 so conformed as to permit the ball to turn in the socket '6. The collar 8 is retained in position byy means of a plurality of screws 9, as illustrated. Formed integral with the ball 7 is a hollow cylin- SoHossLER,

-Specication or Letters Patent. Y Patented Aug. d5, 11216., Applicationled September 18, 1914. Serial No. 862,269.

- circling the portion 14 of the stem 12 is a Washer 15 having a plurality of apertures -formed therein.- At 16, 16 l have illustrated a plurality of coiled springs, each one of which has one end thereof disposed in one ofthe apertures in the washer 15, and the other endthereof attached to an eye-nut 17 threaded upon the end of a screw 18 passing through the base 5. The base is provided with a closure plate 19 which keeps the dust and dirt out of the base and otherwise protects the parts contained within the base. It will be seen that the tension of the springs 16, 16 may be readily adjusted by means of the screws 18, and that the springs 416, 16 normally tend to retain the hollow standard 11 in a vertical position. The standard 11 may, however, be inclined from the vertical in any direction within certain limits, but when released is returned to a vertical position by the springs 16.

Secured to the upper portion of the hollow standard 11 is a hollow casting 20, the upper end of which is provided with a head plate 21 secured in position by means of suitable screws, as Lillustrated. Projecting into the hollow standard 11 is seat-post 22. At 23 l have shown a circular plate upon which may be secured in any suitable manner a `seat or cushion 24, said plate being provided with a central boss 25 having a lower portion 26 of increased cross-section. The central boss 25 is hollow to receive the upper end of the seat post 22, the said vseatpost 22 being retained in position by means of'a set-screw 27 passing through theboss 25 and entering an annular groove 28 in the seat-post. rlFhe upper end of the seatpost 22 is hollowed out to receive an anti-friction ball'29, as illustrated in Fig. 2.

As is most clearly shown in Fig. 3, an inverted cone-shaped element 30 is retained upon the lower end of the seat-post 22 by means of a' shoulder screw 31 threaded into the lower end of the seat-post. Disposed around the shoulder-screw 31 and located lbelOw the c0ne-shaped element 30 is an element which maybe termed the lower ball cup 32. This lower lball cup rests upon a coiled spring 33, which normally tends to move said lower cup upwardly. Disposed a round theupper portion of the cone-shaped element and indicated at 34, is what. may be called the upper ball cup, and located between said hall cups and around the coneshaped clement 30 is a plurality of balls 35. Resting upon the upper ball cup 34 and incircling the seat-post 22 is a sleeve 36, upon the upper end of which is disposed a collar 37. Passing tlnough the enlarged portion 26 of the boss 25 and engaging the collar 37 is a plurality of pins 38, each one of'which is engaged at its upper end by one end of a lever 39. Eachv of thelevers 39 is pivotally mounted at to a lug 41 formed integral with or otherwisey carried by the plate 23 supporting the seat 24. The outer ends of the levers '39 are reduced at 42 and enter `apertures in an annulus 43 disposed in immediate proximity to the bottom of the seat or cushion 24. There may be any desired number of the levers 39. In ordinary constructions,' I llnd it desirableto utilize approximately five levers.

It will be seen that when the operator of the stool shown in the drawings raises the annulus 43, a number of levers 39 are operated, and the pins 38 are' depressed, thus thrusting the sleeve 36'd0wnwardly. The upper and lower ball cups 32 and 34, the

balls 35, and the cone-shaped member 30l constitute 'a detent for retaining the seatpost at any desired position relative to the hollow standard 11. The weight of the seat and seat-post normally holds the coneshaped member 30 in position to thrust the balls 35 outwardly -in engagement with the hollow lstandard 11. When the operator is seated upon the stool, the force tending to move the balls 35 outwardly is greatly increased, and the seat-post is securely locked to the standard 11., When the seat is raised, the cone-shaped member 30 moves slightly with respect to the balls 35, and permits said balls to move inwardly out of engagement with the hollow standard 11, thus unlocking the seat-post from the-hollow standard 11. When the seat-post is to be lowered, the sleeve 36 is forced downwardly by opervating the levers 39, thus reducing the circumference of the ball train 35 and permit; ting the seat-post to be lowered.

At 44 in Figs. 2 and 3' of the drawings I have illustrated asleeve 44 which limits the upward movement of the seat-post.

While I have illustrated my invention in4 the particular embodiment herein described, I do not wish to be Vlimited to this particular construction, but wish to claim any equivalents thereof which may' suggest themselves to those skilled in the art to which my invention relates.

-the standard, and ypositively actin said seat-post, ,clutch balls disposed around said conical element, said conical element arranged to engage said balls and force the same into engagement with the standard, a sleeve disposed around said seat-post arranged whenoperated to engage and move the balls relatively to .said conical element and standard to fully release the seat-post,

and means for operating said sleeve, 2. A stool of the class described comprismg a hollow standard, .a seat-post movable Within the standard, a seat carried by the seat-post, balls carried by the seat-post, said seat-post comprising a portion arranged to force said balls into engagement with the standard, and manually-operable means for engaging and moving said balls independently of the seat-post to release the seatpost from the standard.

3. A device of the class described comprising a hollow standard, a seat post movable within the standard, a seat carried by the seat post, a cone formed upon the seat post near the lower endLthereof, a' pair of sleeves disposed around the seat post, a train of clutch balls between the sleeves and encirclingsaid cone arranged. to lock the seat post to the standard, a shoulder on the seat post at the lower end thereof, an expansion spring acting between said shoulder and the .lower sleeve, and means for moving the upper sleeve to engage and move the clutch balls against the tension of said spring and independently of the seat post to fully release the seat post from the standard.

4. A stool comprising a standard, a seat.

post telescopically mounted thereon, a seat carried vby the seat post, a ycone carried by the seat post, clutch devices interposed be' tween the cone and standard arranged to co operate with the cone to lock the post to the standard, and positively acting mechanical releasing mechanism for moving the clutch devices to a position to release the post from the standar 5. A stool comprising a standard, 'a seat post telescopically mounted thereon, a seat carried' by the seat post, a cone carried by the seat post, clutch devices interposed between the cone and standard arranged to cooperate with the cone to lock the post to mechanical releasing mechanism for ren ering the clutch devices inoperative to fully release the post from the standard.

6. A stool comprising a hollow standard, a seat post telescopically mounted therein, a seat carried by the seat post,la cone carried by the seat post, clutch' devices interlao posed between the cone and standard army namethis 10 day of September, A. D. ranged t0 coperate with the cone to lock 1914. the post to the standard, and positively acting mechanical releasing mechanism for CARL EMIL SCHSSLER" 5 rendering the clutch devices inoperative to Witnesses:

fully release the post from the standard. C. S. BIGELOW,

In witness whereof, ll hereunto subscribe M. H. MCFELLIN. 

